Power unit



R. HOE

POWER UNIT Dec. 4, 1934.

Original Filed Jan. 2. 1930 3 Sheets-Sheet l INVEN OR ATTORNEYS.

Dec. 4, 1934'. HOE 1,983,292

POWER UNIT Original Filed Jan. 2. 1930 3 Sheets-Sheet 2 INVENT R v WDec. 4, 1934. R HOE POWER UNI!|- Original Fil ed Jan. 2, 1930 3SheetsSheet 3 INVEZORI fw A ORNE 5.

Patented Bee. 4, 1934 odriml applicafllll him 2, 1930, Serial No.

418,1,lowPatcntNo. 1,064,104. Divided this mm This invention relates toa novel and improved powerunitandisadivisionofmycopending applicationSerial No. 418,109. The novel features will be best understood from thefollowing description and the annexed. drawings in which I have shown aselected embodiment of the invention, and in which Fig. 1 is a verticalelevation of a power unit having ,one type of device associatedtherewith.

Fig. 2 is a plan view of the structure appearing in Fig. 1.

-Fig. 3 is a vertical sectional view through the casing containing thegearing.

Fig. 4 is a view showing one form of device which may be operated fromthe power unit.

Fig. 5 is a view showing the left-hand end of the casing as appearing inFig. 3 and taken on the line55of Fig. 6.

Fig.6isaplanofthecasingappearinginfig.

5 when having applied thereto the device shown inFig.4.

Fig.7isaviewsimilarto1 'ig.6,butshowing the casing having appliedthereto the device showninFigs. 1,2and 3.

Referring first teFigsi and 2, I have shown thereinabase 1 supported'bylegs2and carryingamotor3havingashaft4. Alsomountedonthebase1isagearcasing5which,asbst showninl 'ig.3,isformedofaverticalwallfi having integral therewiththebottomwall7, topwall8andsidewalls9and10. Theresultisan integralboxwlthonlyoneopensidewhichis closedbymeansofaplatell. 'lheboxmaybeseem-edtothehaseasbybolts12.

fully Fformthedrlvlngshaftsoftheflnerunlt.

and 17 arefurther and 16, 1930, Serial No.

I! aim. (c1. u-ii) hasonitsendapinion23 meshingwithagear 24 on the shaft16. This arrangement, as will be seen; provides a reduction gearingbetween the shafts 4 and 16, and a further reduction gearing is providedbetween the shafts 16 and 17 by the pinion 25 on the shaft 16 meshingwith the gear 26 on the shaft 17. By this'arrangement, it will be seenthat the shaft 16 is rotated in one direction at a relatively high rateof speed.

whereas the shaft 17-is rotated in the opposite direction at arelatively low rate of speed. In one embodiment which I have built, theshaft 1 16 is designed to rotate at a speed of 381 R. P. M. and in aclockwise direction, while the shaft 17 To is designed to rotate at aspeed of 92 R. P. M in a counterclockwise direction.

Each of the shafts 16 and 17 is designed to operate some device whichmay be detachably connected to the unit and, usually, such a deviceisintendedto behingedtotheunitsothatitmay he swung into and out of aposition wherein it will be operated by one of the drivingshafts. In theform shown. I provide three hinge pins 27, 28, and 29, arrangedvertically one beneath the so other. It will be seen that the pins27 and28 are arranged on opposite sides of the shaft 16, whereas the pins 28and 29 are arranged on opposlte sides of the shaft 17. By thisarrangement, the intermediate pin 28- forms a common hinge element whichmay be used with a device operated by either shaft.

Each of the pins 27, 28 and 29 is supported on an car 30 projecting fromthe casing, and. ontheear30whichsupportsthepin 27Ihave shown an upwardlyextending lug 31 having its face 32 spaced from the pin 27 and parallelthereto, although this is not essential. The space between the faceofthe pin 27 and the face32 of the mg is such that a hinge elementcooperating with the pin 27 may be received between the pin and the lugif properly designedto'flt into this space, but if not so designed, thelug will prevent the hinge element from coming to rest on the pin to-asufllcient extent to prevent the no device carried by the hinge elementfrom being operatedbytheshaft 16. 4

Certaindeviceswhichareadaptedtobe used in connection with a power unitmay be safely operated at different speeds, while others should beoperated only at low speeds. Therefore, the devices which may beoperated at low speeds areprovided with hinge elements in the formofears33ofsuchsizethat theycanbereceived on thepins 28 and 29 but willnot'nt beno tweenthepin27andthefaceofthelug31. On

operatedat a relatively high speed at which. the shaft 16 rotates isprovided with a hinge element in the form of an ear which can bereceived on the pin 27, without being obstructed by the lug 31. Thisprovides a safety device which is of prime importance on a power unit ofthis type which is designed for use in the home. For example, the beater34 shown in Figs. 1 and 2 is one form of a device which may at differenttimes be properly operated at different speeds,

.and this device can be placed upon either the pins 28 and 29 as in Fig.1, or the pins 27 and 28 as in Fig. 3. When placed upon one set of pins,it will cooperate with the driving shaft 17, and when placed on theother set it will bedriven by the shaft 16, although in the oppositedirection.

Incidentally, the safety feature described above is used to prevent therotation of a device 'in the wrong direction, a device which should theshaft 16 through a clutch connection con-- sisting of a pin 36 extendinglaterally from the shaft 35 and adapted to be received in oppositerecesses 37 in the end of the shaft 16 or 17.

In Figs. 4 and 6 are shown a. form of device which may be secured to anddriven from one of the driving shafts 16 or 17 without the hinge supportpreviously described. This device is i1- lustrated as a grinding wheel38 mounted on a shaft 39, from which extends a laterally disposed pin 40adapted to be received in the recesses 37 of one of the shafts 16 or 17.As best shown in Figs. 3, 6 and 7 each shaft 16 andl'l is provided witha centrally disposed longitudinally extending bore 41, and this borewill be described with respect to the shaft 16, the shaft 1'7 being ofidentical construction.

As will be seen, this bore has a portion substantially of the size ofthe driven shaft of the device operated by the shaft in which the boreis provided, so that a driven shaft may be. inserted in the bore. InFig. 3, the driven shaft terminates in the outer end of the bore whichis enlarged, as shown in Figs. 5, 6 and' '7, to form the recesses 37. Itwill be noted by reference to Fig. 5, that these recesses are separatedby elements 42 which are adapted to engage with the pin 36 or 40. Theelements 42 and 36 or 40 form the coacting clutch element on thedifferent shafts.

The inner end of the bore 41 is provided with a circumferentiallyextending groove or recess 43 which has no function when a device suchas that shown in Figs. 1, 2, 3 and '7 is used. In such a device, thehinge and a suitable latch to be described later are used to hold theshafts in position. However, there are devices which may be used with apower unit, which it is not necessary or desirable to hinge to the unitsuch, for example,

. eng

1,988,292 the other hand, a device which can be safely balls 44 formingdetents which are adapted to engage in the circumferential groove 43. Bythis arrangement, the shaft 39 may be inserted in the bore 41, the ballor balls 44 being received in the groove to hold the shaft 39in positionwherein the clutch element 40 will cooperate with the clutch elements42, and thus the shaft 39 will be driven by the shaft 16.

When the power unit is used with a device hinged thereto, the device isheld in position by a latch indicated generally at 45, one such latchbeing associated with each of the shafts 16 and 1'7. The. details ofthese latches are more fully described and are claimed in my aforesaidcopending application Serial No. 418,109.

- When a driving shaft on the unit and a driven shaft on a device arebrought into cooperative relation, it is essential that this relationshould be maintained. This relation might be disturbed by the operationof a device which would tend to lift the hinge ears from their pins.This is apt to occur, for example, if for any reason the driving anddriven shafts are out of alignment, in which case one end of a pin 36will strike a clutch element 42 'before the other end will. In order toinsure the correct positioning of the shafts and the maintenance of thisposition, I provide coopcrating elements on the unit and of the devicewhich will prevent movement of the device on its hinges. In thisembodiment, each one of the 405 bosses 13 and 14 is provided on itsbottom with a flattened portion 46, beneath which is received a lug 47on the device which is being driven from the shaft within the particularboss. This arrangement is best shown in Figs. 3 and 5. n

It is to be understood that various changes in the embodiment of theinvention illustrated and described herein may be made within the scopeof the invention, and therefore I do not intend to limit myself, exceptby the appended claims.

I claim:

1. A power unit having a gear casing with a driving shaft mountedthereon, means on said shaft adjacent one end thereof to support androtate a driven shaft on an operative device, means to support adifferent operative device on said casing, said second named device alsohaving a driven shaft, and meansto operate said last-named driven shaftfrom said end of said driving shaft. 2

2. A power unit having a gear casing and a driving shaft mountedtherein, a device having a driven shaft, means to hingesaid device tothe casing, cooperating clutch elements on said. driving and drivenshafts, means to hold said device on the hinge in position wherein saidclutch elements operate to drive the driven shaft from the drivingshaft, means on the driving shaft to suppo a second device having adriven shaft by ment with said driven shaft and said driv- @35 ingshaft, and clutch elements on the driven shaft of said second devicecooperating with the clutch elements on the driving shaft.

3. A power unit comprising a casing .having a driving shaft mountedthereon, said driving shaft having a longitudinally extending bore atthe end thereof, with the outer end of the bore enlarged to form anoutwardly facing recess, a device having a driven shaft provided withmeans adapted to be received in said recess to form a drivin connectionbetween'the shafts, means to support said device on the casing with saidshafts in operative position, said bore having a substantial depth toreceive a shaft on a second device closely be received in said recess toform an operative connection between said shafts, whereby said seconddevice may be substantially entirely supported by the driving shaft.

4. A power unit coniprising a casing having a driving shaft mounthereon, said shaft having a longitudinally ending bore and a clutchelement at the end thereof, a device having a driven shaft with a clutchelement adapted to cooperate with the clutch element on said drivingshaft, means to support said deviceon the casing with said clutchelemeiits in cooperative relation, said bore having a substantial depthto receive a shaft on a second device having a clutch element adapted tocooperate with said first-named clutch element, whereby said seconddevice may be entirely supported within said bore.

5. A power unit comprising a horizontally disposed driving shaft mountedin fixed bearings,

one end of said shaft having alongitudinally extending bore therein adriven shaft having one end closely fitting within said bore whereby theshaft supports the driven shaft, a device on said driven shaft andsupported thereby directly and entirely by said driving shaft,cooperating clutch elements on said shafts, means other than saiddriving shaft to support on said unit a second device having a drivenshaft, with said driven shaft of the second device in cooperativerelation with said driving shaft, said driven shaft of the second devicehaving clutch elements adapted to cooperate with said clutch elements onthe driving shaft when the second device is thus supported on said unit.

6. A power unit comprising a horizontally disposed driving shaft mountedin fixed bearings, one end of said shaft having a longitudinallyextending bore therein, a driven shaft having one end closely fittingwithin said bore whereby the driving shaft supports the driven shaft, adevice on said driven shaft and supported thereby directly and entirelyby said driving shaft, cooperating clutch elements on said shafts, meansother than said driving shaft to support on said unit a second devicehaving a driven shaft, with said driven shaft of the second device incooperative relation with said driving shaft and located out of saidbore, said driven shaft of the second device having clutch elementsadapted to cooperate with said clutch elements on the driving shaft whenthe second device is thus supported on said '7. A power unit comprisinga horizontally disposed driving shaft mounted in fixed bearings, one endof said shaft having a longitudinally extending bore therein, a drivenshaft having one end closely fitting within said bore whereby thedriving shaft supports the driven shaft, a device on said driven shaftand supported thereby di-' rectly and entirely by said driving shaft,cooperating clutch elements on said shafts, means yieldingly holdingsaid driven shaft insaid bore, means other than said driving shaft tosupport on said unit a second device having a driven shaft, with saiddriven shaft of the second device in cooperative relation with saiddriving shaft, said driven shaft of the second device having clutchelements adapted to cooperate with said clutch elements on the drivingshaft when the second device is thus supported on, said unit.

8. A power unit comprising a horizontally disposed driving shaft mountedin fixed bearings, one end of said shaft having a longitudinallyextending bore therein, a driven shaft having one end closely fittingwithin said bore whereby the driving shaft supports the driven shaft, adevice on said driven shaft and supported thereby directly and entirelyby said driving shaft, cooperating clutch elements on said shafts, meansyieldingly holding said driven shaft in said bore, means other than saiddriving shaft to support on said unit a second device having a drivenshaft, witl said driven shaft of the second device in cooperativerelation with said driving shaft and located out of said bore, saiddriven shaft of the second device'having clutch elements adapted tocooperate with said clutch elements on the driving shaft when the seconddevice is thus supported on said unit.

ROBERT HOE.

